mirror of
https://github.com/kanaka/mal.git
synced 2024-09-20 18:18:51 +03:00
116 lines
2.6 KiB
Julia
Executable File
116 lines
2.6 KiB
Julia
Executable File
#!/usr/bin/env julia
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push!(LOAD_PATH, pwd(), "/usr/share/julia/base")
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import readline_mod
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import reader
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import printer
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using env
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import core
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using types
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# READ
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function READ(str)
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reader.read_str(str)
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end
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# EVAL
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function eval_ast(ast, env)
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if typeof(ast) == Symbol
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env_get(env,ast)
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elseif isa(ast, Array) || isa(ast, Tuple)
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map((x) -> EVAL(x,env), ast)
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elseif isa(ast, Dict)
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[EVAL(x[1],env) => EVAL(x[2], env) for x=ast]
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else
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ast
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end
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end
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function EVAL(ast, env)
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while true
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#println("EVAL: $(printer.pr_str(ast,true))")
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if !isa(ast, Array) return eval_ast(ast, env) end
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# apply
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if :def! == ast[1]
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return env_set(env, ast[2], EVAL(ast[3], env))
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elseif symbol("let*") == ast[1]
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let_env = Env(env)
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for i = 1:2:length(ast[2])
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env_set(let_env, ast[2][i], EVAL(ast[2][i+1], let_env))
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end
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env = let_env
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ast = ast[3]
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# TCO loop
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elseif :do == ast[1]
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eval_ast(ast[2:end-1], env)
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ast = ast[end]
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# TCO loop
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elseif :if == ast[1]
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cond = EVAL(ast[2], env)
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if cond === nothing || cond === false
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if length(ast) >= 4
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ast = ast[4]
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# TCO loop
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else
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return nothing
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end
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else
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ast = ast[3]
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# TCO loop
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end
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elseif symbol("fn*") == ast[1]
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return MalFunc(
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(args...) -> EVAL(ast[3], Env(env, ast[2], Any[args...])),
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ast[3], env, ast[2])
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else
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el = eval_ast(ast, env)
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f, args = el[1], el[2:end]
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if isa(f, MalFunc)
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ast = f.ast
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env = Env(f.env, f.params, args)
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# TCO loop
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else
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return f(args...)
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end
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end
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end
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end
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# PRINT
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function PRINT(exp)
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printer.pr_str(exp)
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end
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# REPL
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repl_env = nothing
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function REP(str)
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return PRINT(EVAL(READ(str), repl_env))
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end
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# core.jl: defined using Julia
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repl_env = Env(nothing, core.ns)
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# core.mal: defined using the language itself
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REP("(def! not (fn* (a) (if a false true)))")
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while true
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line = readline_mod.do_readline("user> ")
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if line === nothing break end
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try
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println(REP(line))
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catch e
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if isa(e, ErrorException)
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println("Error: $(e.msg)")
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else
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println("Error: $(string(e))")
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end
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# TODO: show at least part of stack
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if !isa(e, StackOverflowError)
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bt = catch_backtrace()
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Base.show_backtrace(STDERR, bt)
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end
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println()
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end
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end
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